Odd, most birds ignore cannabis that has no seeds.
I'm guessing that those strings will prove to be ineffective.
Think about it.
They are not much different from twigs and vines, yah?

Get a "turkey tray", (large, thin, shiny aluminum, roasting pan), and cut it into 2" squares, or circles.
(Make snowflakes if ya wanna.)
Hang them from thin strings like dental floss.
The slightest breeze will set them spinning and tinkling.
The specular reflections and the tinkling annoys the birds.
It is said to disorient the moths that lay budworm eggs as well.

Or.
If you have the cash, buy a 5' X 10' dog kennel and a large roll of windowscreen.
Attachment 284703

Hawaiian birds are well behaved and when I found that dryer sheets repel almost all flying insect pests, I did not have to install the screening.
The large mesh is quite effective against 2 legged pests.

Aloha,
Weezard